Section Cover Page
Section 232513
Cleaning and Chemical Treatment
2011-11-09 of Hydronic Systems

Use this Section to specify the chemical cleaning and treatment of hydronic systems. Refer to Section 232502 for a complete list of sections related to Chemical Cleaning and Treatment of Mechanical Systems.

This Master Specification Section contains:

.1 This Cover Sheet

.2 Data Sheet – Reference Standards

.3 Data Sheet - Guidelines for Renovated Systems

.4 Specification Section Text:

1. General

1.1 Intent

1.2 Related Requirements

1.3 Reference Documents

1.4 Performance Requirements

1.5 Submittals

2. Products

2.1 Cleaning Chemicals

2.2 Chemical Treatment Materials

2.3 Miscellaneous Materials

2.4 Water Test Equipment

3. Execution

3.1 Equipment Installation

3.2 Cleaning - General

3.3 Cleaning Procedure

3.4 Deposit Removal Procedure

3.5 Chemical Treatment - Control Limits

3.6  Operation Maintenance Until Interim Acceptance

3.7  Waste Water Disposal

3.8 Chemical Cleaning and Treatment Schedule for Renovated Systems

BMS Basic Master Specification
Alberta Infrastructure
Master Specification System / Page 0
Data Sheet - Guidelines for Renovated Systems
Section 232513
Cleaning and Chemical Treatment
2010-12-31 of Hydronic Systems

1. When any of the following work has been performed, no cleaning is required but loose deposits must be flushed out before flooding with system water.

.1 A minor amount of new piping is added to the system when compared with the entire system.

.2 Fintube boiler is retubed.

.3 Less than approximately 50% of the tubes are replaced in a firetube boiler.

.4 Chiller or converter is retubed.

2. New piping which can be isolated from the rest of the system:

.1 Clean piping using the chemical cleaner and procedure specified in 2.1.1 and 3.3.

.2 Chemically treat the entire system with a corrosion inhibitor specified in 2.2 and 3.5.

3. New piping which can not be isolated from the rest of the system:

.1 Clean the deposits from the entire system as specified in 2.1.2 and 3.4.

.2 Clean the entire system with the chemical cleaner and procedure specified in 2.1.1 and 3.3.

.3 Chemically treat the entire system with a corrosion inhibitor specified in 2.2 and 3.5.

4. Firetube boilers where more than approximately 50% of the tubes in are replaced:

.1 Isolate the boiler from the rest of the system.

.2 Clean the deposits from the boiler as specified in 2.1.2 and 3.4.

.3 Clean the boiler with the chemical cleaner and procedure specified in 2.1.1 and 3.3.

.4 Chemically treat the boiler with a corrosion inhibitor specified in 2.2 and 3.5.

5. Removal of deposits from system/boiler where no new piping is added or retubing is done:

.1 Clean the deposits from the system/boiler as specified in 2.1.2 and 3.4.

.2 Chemically treat the system/boiler with a corrosion inhibitor specified in 2.2 and 3.5.

END OF DATA SHEETS

BMS Basic Master Specification
Alberta Infrastructure
Master Specification System / Page 0
Section 232513
Cleaning and Chemical Treatment
Plan No: of Hydronic Systems
Project ID: Page 1

1. General

1.1 INTENT

.1 This Section specifies services and material required for onsite, cleaning and chemical treatment of a multi-metal, closed loop [hot water heating system] [and] [chilled water system].

1.2 RELATED Requirements

.1 Mechanical Spare Parts and Maintenance Materials: Section 200023.

.2 Chemical Cleaning and Treatment Equipment: Section 232501.

.3 Chemical Cleaning and Treatment - General Requirements: Section 232502.

1.3 REFERENCE DOCUMENTS

.1 American Society for Testing and Materials (ASTM):

.1 / ASTM D2688-05 / Standard Test Methods for Corrosivity of Water in the Absence of Heat Transfer (Weight Loss Methods)

.2 Alberta Infrastructure Water Treatment Program Manual

1.4 PERFORMANCE REQUIREMENTS

.1 Clean hydronic system to remove oil, grease, silt, and rust and leave metal surfaces well passivated.

.2 Chemically treat and maintain hydronic system water to meet following standards:

Parameter / Control Limits
Suspended solids: / Nil.
Iron Corrosion Rate: / stable rate, 0.5 mils per year maximum, no pitting.
Copper Corrosion Rate: / stable rate, 0.2 mils per year maximum, no pitting.
Total Iron Concentration: / 0.5 mg/L Fe maximum.
Total Copper Concentration: / 0.2 mg/L Cu maximum.
Total Plate Count / 103 organisms/mL maximum.
PH / 8.5 – 9.5, accuracy ±0.1
Conductivity / <2500 mS/cm (micro siemens/cm)

1.5 SUBMITTALS

.1 In addition to submittal requirements specified in Section 232502, submit a written report of actual cleaning activities including:

.1 Times.

.2 System status.

.3 Problems encountered.

.4 Actions taken.

.5 Composition of cleaning & spent cleaning solutions.

.6 Inspection results.

.7 Final concentration of corrosion inhibitor in system.

.8 Corrosion coupon weights.

.9 Corrosion rates.

.10 Final suspended solids concentration in system.

.11 Final iron concentration in system.

.12 Final copper concentration in system.

.13 Final pH.

.14 Final conductivity.

2. Products

SPECNOTE:Inside surfaces of hot water heating systems components must not be galvanized.

2.1 CLEANING CHEMICALS

.1 Cleaning Solution: neutral pH cleaning solution which is capable of removing oil, grease, and rust from metal surfaces of system and passivating cleaned metal surfaces of system. Cleaning solution shall include:

.1 Low foaming nonionic surfactant for penetrating oily and greasy deposit surfaces.

.2 Solvent for dissolving oil and grease.

.3 Dispersant for dissolving rust.

.4 Reducing agent for corrosion control.

.5 Ferrous and nonferrous metal corrosion inhibitors.

SPECNOTE:Specify deposit removal cleaning solution for existing systems.

.2 Deposit Removal Cleaning Solution: blended neutral pH cleaning solution which is capable of removing scale and iron deposits, destroying bacteria, and passivating the metal surfaces of system.

2.2 CHEMICAL TREATMENT MATERIALS

SPECNOTE:Sulphite or an Organic based corrosion inhibitor is the preferred corrosion inhibitor for all Alberta Infrastructure projects.

- New Systems: use sulphite or an Organic based corrosion inhibitor for all new systems.

-  ExistingSystems: use a corrosion inhibitor that is compatible with the existing corrosion inhibitor.

-  Conversion: where practical, consider converting existing systems that are using other corrosion inhibitors, to a sulphite or Organic based corrosion inhibitor. Consult with the facility manager.

.1 Corrosion Inhibitor: containing following:

.1 Sulphite or organic based materials for corrosion protection of ferrous material in system.

.2 Corrosion inhibitor of non-ferrous material.

.3 Buffer for pH level control.

2.3 MISCELLANEOUS MATERIALS

.1 Corrosion Coupons: supplied by the Minister.

.2 By-pass Filter Cartridge: sized between 5 and 20 microns for retention of particles greater than 20 microns in diameter.

2.4 WATER TEST EQUIPMENT

.1 Supply one of each of the following water test kits specified in Section 232502:

.1 pH test kit.

.2 Corrosion inhibitor test kit.

.3 TDS (Total Dissolved Solids) or Conductivity Meter.

3. Execution

3.1 EQUIPMENT INSTALLATION

.1 Prior to performing chemical treatment work ensure following work specified in Section 232501 has been completed:

.1 Sample cooler - for hot water heating systems only.

.2 Chemical pot feeder.

.3 By-pass filter and flow indicator.

.4 Corrosion coupon rack as per detail drawing 23 25 01.

3.2 CLEANING - GENERAL

.1 Maintain following conditions during cleaning process:

.1 Manual and automatic valves are in full open position.

.2 By-pass valves are operated to ensure full flow through entire system.

.3 Safety devices, including pressure relief valves, flow switches, and pressure switches are functioning.

.4 System is operated with a minimum pressure of 35kPa(g) at highest point and expansion tank level is maintained at 1/3 to 1/2 full of water.

.5 Temporary fine mesh strainers for system pump and control valve strainer baskets are installed and cleaned as required.

3.3 CLEANING PROCEDURE

.1 Step1:Fill system with domestic water, establish circulation, and heat system contents to a temperature of 60°C.

.2 Step2:After two hours of circulation, collect water samples from at least three different locations in system. If these samples contain suspended solids, clean out strainer baskets, drain system, and repeat steps 1 & 2.

.3 Step3:Blend in prepared concentrated cleaning solution, establish circulation, and maintain system temperature at 60°C for at least three days.

.4 Step4:Dump spent cleaning solution to disposal, fill system with domestic water, circulate system contents for at least two hours, and dump spent rinse water to disposal.

.5 Step5:Fill system with domestic water and repeat step 4 until water samples collected from system are free of oil, grease, and suspended solids.

.6 Step6:Drain system completely, including all system low points and perform visual inspections of metal surfaces at three different locations.

.7 Complete steps 4, 5 & 6 within a 24 hour period.

.8 If metal surfaces contain oil/grease or silt, fill the system with domestic water and repeat steps 3, 4, 5 & 6.

.9 Immediately after inspection is completed, install filter cartridge, operating pump and control valve strainers fill system with domestic water, blend in concentrated corrosion inhibitor solution until its concentration in system is at an acceptable level for film formation, and pass system water through by-pass filter and corrosion coupon rack.

SPECNOTE:Specify deposit removal procedure for cleaning of existing systems.

3.4 DEPOSIT REMOVAL PROCEDURE

.1 Step1:Fill system with domestic water, establish circulation, and heat system contents to a temperature of 60°C;

.2 Step2:Blend in prepared concentrated cleaning solution for removal of deposits etc., establish circulation, and maintain system temperature at 60°C until total iron concentration stabilizes;

.3 Step3:Dump spent cleaning solution to disposal, fill system with domestic water, circulate system contents for at least two hours, and drain spent rinse water from various locations in system to disposal;

.4 Step4:Fill system with domestic water and repeat step3 until water samples collected from system are free of suspended material;

.5 Step5:Drain system and perform visual inspections of metal surfaces at three different locations;

.6 Complete steps 3, 4, & 5 within a 24 hour period.

.7 Step6:If metal surfaces contain scale or iron deposits and are not passivated, fill system with domestic water and repeat steps 2,3,45.

3.5 CHEMICAL TREATMENT - CONTROL LIMITS

.1 For first month after chemical treatment maintain primary control limits at upper limits.

.2 Maintain following control limits for inhibitor used in system until Interim Acceptance of the Work:

Inhibitor / Primary Control Limits / Secondary Control Limits
SPECNOTE:Specify only the inhibitor which is specified in Clause 2.2.
Sulphite / 50-100 mg/L SO3 / 8.5-9.5 pH
80-160 mg/L Na2SO3 / 2000 mg/L TDS max or
2500 mS/cm (micro siemens/cm)
8.0-9.5 pH
2000 mg/L TDS max or
2500 µS/cm (micro siemens/cm)
Organic / 12-20 mg/L PO4 organic = Phosphonate
Note: Organic PO4 acceptable residuals may vary due to manufacturers recommendations and may be tested for by various proven test methods as recommended by the manufacturer.

3.6 OPERATION MAINTENANCE UNTIL INTERIM ACCEPTANCE

.1 Perform following minimum routine maintenance until Interim Acceptance of the Work:

.1 Maintain control limits specified under “Performance Requirements” and “Chemical Treatment - Control Limits”. Add chemicals as required.

.2 Replace fouled filter cartridges in by-pass filter with new filter cartridges as required to maintain continuous flow through filter.

.3 Test water samples of system monthly for following :

.1 Visual appearance.

.2 pH levels.

.3 TDS concentration.

.4 Corrosion inhibitor concentration.

.5 Total plate count.

.2 Document water analyses results, quantities, dates chemicals added and make-up water used on chemical treatment report form.

3.7 Waste Water Disposal

.1 Wastewater discharged into a municipal sanitary sewer system from existing or new systems shall be within the limits established by local authorities. Where no local limits have been established, stay within limits specified in “Alberta Infrastructure Water Treatment Program Manual, Section I - Environmental Guideline”.

3.8 CHEMICAL CLEANING AND TREATMENT SCHEDULE FOR RENOVATED SYSTEMS

SPECNOTESchedule cleaning requirements for renovated hydronic systems based on the guidelines on Page 01.

.1 Clean and treat renovated hydronic systems as follows:

.1 Re-tubed fintube boiler:

.1 Flush out loose deposits before flooding with system water.

.2 New pipingisolated from rest of system:

.1 Chemically clean piping.

.2 Chemically treat entire system with corrosion inhibitor.

.3 []:

.1 [].

.2 [].

.3 [].

END OF SECTION

2010-12-31 BMS Version